Interference Cancellation via Cooperative Sensing Receivers
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Solution Overview
Problem
Conventional communication systems face interference issues due to self-jamming and external signals, which degrade performance, as existing interference cancellation techniques are inadequate for unknown external interference sources.
Innovation Solution
A communication device with at least two receivers detects and mitigates interference by generating a baseband reference signal from an interfering signal, allowing the second receiver to reconstruct and remove interference from a composite signal, thereby improving signal fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional interference cancellation techniques are used, then self-jamming interference from co-located transmitters can be mitigated, but interference from unknown external sources cannot be effectively removed
Solution Approach 1:
The patent segments the interference cancellation function across multiple receivers within the same communication device. One receiver is dedicated to detecting the interfering signal while another receiver receives the composite signal containing both desired and interfering components. This segmentation enables the system to handle unknown external interference sources by distributing the cancellation task across separate detection and processing paths.
Solution Approach 2:
The patent introduces a baseband reference signal as an intermediary element that mediates between the detected interfering signal and the composite signal. The baseband reference signal serves as a template that enables correlation-based detection and reconstruction of interfering components in the composite signal, allowing effective cancellation of external interference without requiring direct knowledge of the interference source characteristics.
2Object-affected harmful factors
If multiple receivers are used to detect and cancel interference, then external interference can be mitigated, but device complexity increases
Solution Approach 1:
The patent makes the multiple receivers serve multiple functions: each receiver既可以 detect desired signals for its intended purpose, can also detect interfering signals, and can generate baseband reference signals for interference cancellation. This multi-functionality allows the system to use existing receiver hardware for both primary reception and interference detection, reducing the need for additional dedicated interference detection components.
Solution Approach 2:
The patent creates a baseband copy or reference version of the interfering signal detected by one receiver. This copied reference signal is then used to reconstruct and cancel the interfering components in the composite signal received by another receiver. The copying approach allows interference cancellation without requiring direct physical access to the interference source, enabling external interference mitigation using existing receiver copies of the signal.
3Measurement precision
If interference signals are removed from composite signals, then signal fidelity is improved, but processing complexity increases
Solution Approach 1:
The patent replaces complex physical or hardware-based interference filtering mechanisms with signal processing operations. Instead of using physical filters or analog cancellation circuits, the system uses digital/baseband signal processing techniques including correlation detection, signal reconstruction, and subtraction operations to remove interfering components. This substitution allows flexible and adaptive interference cancellation that can handle unknown external interference sources while maintaining signal fidelity.
Data Source
AI summary
A first receiver of a victim communication device may detect a first signal from an aggressor transmitter that potentially may interfere with a second signal intended to be received at a second receiver of the victim communication device. It may be determined whether the first signal interferes with the second signal based, at least in part, on the characteristics of the first signal and the second receiver. If the first signal may interfere with the second signal, the second receiver may implement reconstruction and cancelation of the interference attributable to the first signal.